Delta waves are associated with deep sleep and indicate relaxation. Theta waves are linked to daydreaming, creativity, and light meditation. The increase in delta and theta activity when the eyes are open could be due to the brain entering a state of relaxation or daydreaming while maintaining alertness.
Delta
Stage 4 sleep. Stage 3 also often emits delta waves.
Delta sleep is the first sleep to be made up after sleep has been lost. Stage 4 sleep.
The large slow brain waves associated with sleep are called delta waves. These waves are typically observed during deep sleep stages.
It is an album enhanced with Delta binaural beats to lull you to sleep and engage lucid dreaming states.
Delta Waves (APEX)
Delta
Delta
There is alpha or stage one sleep, theta or stage two sleep, delta or statge 3 sleep, and alpha with REM (stage 4 sleep).
The brain wave associated with deep sleep is called delta waves. These slow brain waves are characteristic of the deepest stages of non-rapid eye movement (NREM) sleep. Delta waves are most prominent during the restorative stage of sleep known as slow-wave sleep.
Phenobarb can help make you drowsy. But, it can't increase your REM sleep.